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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2959adafda1d86ffb7bde46bc0eeab9b0875824d6c8bdf3af7d4e716a441b0aa' 
  AND token = 'A4hc8C4GI+rDBuR/wDh4a4N94Q74ly1vHqSbCapOqJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}